15. A properly set caption should be distinct from the body text, yet still be in visual harmony with it. Legibility and readability Captions are usually set fairly small, and yet they’re prime real estate on the page when it comes to drawing the reader’s eye. Therefore, it’s vital that captions be set for both maximum legibility (the design characteristics of the font) and high readability (the size and arrangement of the text). Harmony and contrast In Captions